Added poster support for video tags
Added poster support for video tags

Conflicts:
	lib/fileprocessor.js

dlmiles/grunt-usemin,andreskir/grunt-usemin,schmod/grunt-usemin,liorsion/grunt-usemin,TrevorS/grunt-usemin,trumbitta/grunt-usemin,alippai/grunt-usemin,stephanebachelier/grunt-usemin,happynale/grunt-usemin,happynale/grunt-usemin,liorsion/grunt-usemin,rudasn/grunt-usemin,TrevorS/grunt-usemin,blighli/grunt-usemin,yeoman/grunt-usemin,blighli/grunt-usemin,trumbitta/grunt-usemin,leornado/grunt-usemin-wnd,yeoman/grunt-usemin,rudasn/grunt-usemin,leornado/grunt-usemin-wnd,dlmiles/grunt-usemin,andreskir/grunt-usemin,audibene-em/grunt-usemin,alippai/grunt-usemin,nqdy666/grunt-usemin,nqdy666/grunt-usemin,stephanebachelier/grunt-usemin,audibene-em/grunt-usemin